Description of problem:
In order to connect to new RHV instance, need to provide also "API URL" that match to this structure:
https://myengine.example.com/ovirt-engine/api
It is not clear enough that "API URL" should have the "https://" prefix 


Version-Release number of selected component (if applicable):
OpenShift 4.5.5
CNV 2.4.1


How reproducible:
100%


Actual results:
The user get informed that URL should end with "/ovirt-engine/api" while typing the field value
But it is not mentioned that the URL should start with "https://" 


Additional info:
This issue was found in OpenShift 4.5.5 after starting a VM import. The import failed with import error:

The virtual machine could not be imported.
ValidationFailed: Failed to initialize the source provider (Failed to connect to source provider): Post /ovirt-engine/sso/oauth/token: unsupported protocol scheme ""